Kevin McEnroe admits that he can relate to Nick Reiner's addiction struggles and what it's like to be born into a famous family - even after Nick was charged with two counts of first degree murder for the deaths of his parents Rob Reiner and Michele Singer Reiner. Kevin - the son of John McEnroe and Tatum O'Neal - wrote an essay for The Small Bow, published on Monday, February 2, about his thoughts on the film Being Charlie, a film Nick wrote and his late dad directed. (The film is based on Nick's past experiences with addiction and homelessness.